The ZS44/28.6 headset top assembly from Acros, with a semi-integrated design for 1 1/8" head tubes and standard or tapered steerer tubes, is an all-round worry-free product. It impresses with double sealed angular contact ball bearings made of stainless steel, optimised headset grease and additional seals.
 
Use:
Designed for 1 1/8" upper head tube diameters combined with standard 1 1/8" or 1 1/8" - 1.5" tapered forks.
Specifications:
Application:
Road, Gravel, All Mountain, Cross Country, Enduro, City & Touring
Design:
Zero Stack (ZS)
Top Outer Diameter:
44 mm
Top Inner Diameter:
28.6 mm
Head Tube:
1 1/8"
Steerer Tube:
1 1/8" , 1 1/8" - 1.5" tapered
Technical Information:
Material:
aluminium
Bearings:
Stainless steel angular contact ball bearings, double sealed
Upper Insert Depth:
7.7 mm
Top Stack Height:
8 mm
Seals:
dual double lip seal
Features:
optimised headset grease
dual double lip seal offers protection from moisture and dirt
compression ring made of fibreglass-reinforced composite material with vulcanized seal
long durability with minimal maintenance
Standardized Headset Identification System (S.H.I.S.):
In order to clarify and bring uniformity to a sea of headset standards, manufacturers Acros, Cane Creek, Hope, Race Face, Reset Racing and Ritchey have agreed upon using a shared nomenclature, which will likely include more participating companies in the future. This system takes into account a combination of frame and fork dimensions. Both the top and bottom parts of the headset are marked by two alphanumeric identifiers. The first identifier indicates the type of headset (External Cup, Zero Stack, Integrated) and head tube diameter. The second identifier - separated from the first by a backslash - indicates the diameter of the steerer tube. When referring to a complete headset, the specifications of both top and bottom parts must be combined.
 
Contents:
Acros ZS44/28.6 Headset Top Assembly, consisting of:
1 x headset cup with stainless steel bearings
1 x top cap
1 x Ahead cap
1 x star nut with aluminium bolt
1 x compression ring


 
Weight:
black/ZS44/28.6: 43 g